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NFSv4.1/pnfs: replace broken pnfs_put_lseg_async 

You cannot call pnfs_put_lseg_async() more than once per lseg, so it
is really an inappropriate way to deal with a refcount issue.

Instead, replace it with a function that decrements the refcount, and
puts the final 'free' operation (which is incompatible with locks) on
the workqueue.

Cc: Weston Andros Adamson <dros@primarydata.com>
Fixes: e6cf82d1830f: pnfs: add pnfs_put_lseg_async
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2014-10-08 16:39:12 -04:00
parent ea18cb3f11
commit 6543f80367
3 changed files with 29 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/filelayout/filelayout.c
View File

@ -1031,7 +1031,7 @@ filelayout_clear_request_commit(struct nfs_page *req,
}
out:
nfs_request_remove_commit_list(req, cinfo);
pnfs_put_lseg_async(freeme);
pnfs_put_lseg_locked(freeme);
}
static void

33
fs/nfs/pnfs.c
View File

@ -361,22 +361,43 @@ pnfs_put_lseg(struct pnfs_layout_segment *lseg)
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg);
static void pnfs_put_lseg_async_work(struct work_struct *work)
static void pnfs_free_lseg_async_work(struct work_struct *work)
{
struct pnfs_layout_segment *lseg;
struct pnfs_layout_hdr *lo;
lseg = container_of(work, struct pnfs_layout_segment, pls_work);
lo = lseg->pls_layout;
pnfs_put_lseg(lseg);
pnfs_free_lseg(lseg);
pnfs_put_layout_hdr(lo);
}
static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg)
{
INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work);
schedule_work(&lseg->pls_work);
}
void
pnfs_put_lseg_async(struct pnfs_layout_segment *lseg)
pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg)
{
INIT_WORK(&lseg->pls_work, pnfs_put_lseg_async_work);
schedule_work(&lseg->pls_work);
if (!lseg)
return;
assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock);
dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg,
atomic_read(&lseg->pls_refcount),
test_bit(NFS_LSEG_VALID, &lseg->pls_flags));
if (atomic_dec_and_test(&lseg->pls_refcount)) {
struct pnfs_layout_hdr *lo = lseg->pls_layout;
pnfs_get_layout_hdr(lo);
pnfs_layout_remove_lseg(lo, lseg);
pnfs_free_lseg_async(lseg);
}
}
EXPORT_SYMBOL_GPL(pnfs_put_lseg_async);
EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked);
static u64
end_offset(u64 start, u64 len)

6
fs/nfs/pnfs.h
View File

@ -190,7 +190,7 @@ extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
/* pnfs.c */
void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
void pnfs_put_lseg_async(struct pnfs_layout_segment *lseg);
void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
void unset_pnfs_layoutdriver(struct nfs_server *);
@ -445,10 +445,6 @@ static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
{
}
static inline void pnfs_put_lseg_async(struct pnfs_layout_segment *lseg)
{
}
static inline int pnfs_return_layout(struct inode *ino)
{
return 0;